these 2 derivations will be built:
  /nix/store/fh5qhifwrn11f1n05hrdd424i07z85yx-nix-grpc-store-0.2.1.drv
  /nix/store/i8d3sz1v8n446si9246yaikqpqd0pl79-nix-grpc-store-dispatcher.drv